Answer:
Option B, Central venous pressure
Step-by-step explanation:
Central venous pressure (CVP) is the mean pressure in the vena cava or near the right atrium of heart. CVP is generally expressed in millimeters of mercury i.e mm Hg.
CVP in general is determined by the balance between the output of right ventricles and return from systemic venous thereby making it the pressure arising from largest systemic veins. It represents the pre-load index of left ventricle
Hence, Option B is correct